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CCNA Routing and Switching ICND2 200-105 Official Cert Guide, Academic Edition by Wendell Odom

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Chapter 1. Implementing Ethernet Virtual LANs

Virtual LANs (VLAN) have an impact on many parts of a switch’s logic. Frame forwarding happens per VLAN. MAC learning adds MAC table entries, and those entries include the associated VLAN. Even Spanning Tree Protocol (STP), a big focus in Part I of this book, often happens per-VLAN.

This chapter examines how many switch core features work in the context of VLANs. The chapter breaks the topics into concepts in the first section of the chapter, with configuration and verification in the second half. The topics include VLANs, VLAN trunking, routing between VLANs, plus voice and data VLANs. (Chapter 4, “LAN Troubleshooting,” revisits some of these topics from a troubleshooting perspective.)

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